ref: 5f464c4f5f082f5562a9ed1eb288366ef88147ea dir: /include/bits/linux/sys/stdio.h/
#define BUFSIZ 512 #define FILENAME_MAX 256 #define FOPEN_MAX 16 #define TMP_MAX 25 #define L_tmpnam 256 #define _TMPNAME "/tmp/tmp.0000000"